WBates numberingWCNPJWUniversally unique identifierWGun serial numberWIntegrated Authority FileWInternational Article NumberWInternational Standard Audiovisual NumberWInternational Standard Book NumberWInternational Standard Music NumberWInternational Standard Name IdentifierWInternational Standard Serial NumberWItalian health insurance cardWProduct Licence NumberWSNILS (Russia)WSocial Security numberWUniversal Product CodeWUniversally unique identifier
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